DK150089B

DK150089B - PROCEDURE FOR MANUFACTURING A SLEEPING UNIT AND PROCEDURE FOR USING SUCH A

Info

Publication number: DK150089B
Application number: DK188280A
Authority: DK
Inventors: Ole Kjaer Nielsen
Original assignee: Nordiske Kabel Traad
Priority date: 1980-04-30
Filing date: 1980-04-30
Publication date: 1986-12-01
Also published as: DK188280A; DK150089C

Description

i 150089in 150089

Opfindelsen angår en fremgangsmåde til fremstilling af en til samling eller afslutning af stærkstrømskabler tjenende muffeenhed, der består af en rørformet muffe-krop, i hvis indre der anbringes en eftergivelig slange, 5 hvis ender ekspanderes og fastgøres permanent til muffe- kroppen. Ved fremstilling af sådanne muffeenheder har man hidtil foretaget en ekspansion af slangen ved hjælp af mekaniske organer, der så skulle fjernes, når muffeenheden var bragt på plads over kabelenderne, og betje-10 ningen af en sådan muffeenhed har derfor været temmelig besværlig.BACKGROUND OF THE INVENTION 1. Field of the Invention This invention relates to a method of manufacturing a sleeve assembly for assembling or terminating high current cables, consisting of a tubular sleeve body, the interior of which is provided with a resilient hose, the ends of which are expanded and permanently attached to the sleeve body. In the manufacture of such sleeve assemblies, hitherto an expansion of the hose has been made by means of mechanical means, which would then have to be removed when the sleeve assembly was placed in place over the cable ends, and the operation of such a sleeve assembly has therefore been rather troublesome.

Formålet med opfindelsen er at angive en fremgangsmåde, som dels i sig selv er enkel og billig at udføre, og som yderligere giver mulighed for en meget enkel og hurtig 15 betjening ved anvendelsen af en sådan muffeenhed med sam tidig opnåelse af en fuldstændig tætning af slangen omkring de afbarkede kabler.The object of the invention is to provide a method which, in itself, is simple and inexpensive to carry out, and which further allows for a very simple and quick operation in the use of such a sleeve unit, while at the same time obtaining a complete sealing of the hose. around the barked cables.

Ifølge opfindelsen fremstilles en muffeenhed af den pågældende art på den måde, at den mellem slangeenderne 20 beliggende del af slangen ved hjælp af undertryk i rum met mellem slangen og kroppen bringes til at ekspandere og fastholdes i sin ekspanderede tilstand enten ved hjælp af undertrykket eller ved klæbning imod muffekroppens inderside.According to the invention, a sleeve unit of the kind in question is manufactured in that the part of the hose located between the hose ends 20 is caused to expand and be retained in its expanded state either by means of the vacuum or by means of negative pressure in the space between the hose and the body. adhesion to the inside of the sleeve body.

25 Fremstillingen af en sådan muffeenhed er meget hurtig og let at udføre, og udløsningen af slangens ekspansion kan let foretages i forbindelse med muffeenhedens anvendelse, således at den fremgangsmåde, hvorved muffeenheden er fremstillet, får en væsentlig betydning for 30 muffeenhedens effektivitet og bekvemme brug. Efter muf feenhedens anbringelse over en kabelsamling eller -afslutning, kan slangen på forskellig måde let bringes til 2 150089 tæt omslutning af kablet ved udløsning af undertrykket eller klæbningen.The manufacture of such a socket unit is very quick and easy to carry out, and the release of the hose expansion can be easily carried out in connection with the use of the socket unit, so that the method by which the socket unit is manufactured has a significant impact on the socket unit's efficiency and convenient use. After the sleeve assembly is positioned over a cable assembly or termination, the hose can be easily brought to different enclosures of the cable in various ways upon release of the underpressure or adhesive.

Hvis fremgangsmåden udføres således, at der tilvejebringes klæbning mellem slangens yderside og muffekroppens 5 inderside, er det endvidere ifølge opfindelsen hensigtsmæssigt, at der anvendes et klæbestof, som ved opvarmning i det mindste delvis mister sin klæbeevne. Derved bliver slangen på simpel måde fastholdt i sin ekspanderede tilstand, men kan let frigøres ved en opvarmning, når 10 muffeenheden skal anvendes.Furthermore, if the method is carried out so as to provide adhesion between the outside of the hose and the inside of the sleeve body 5, it is further advantageous in accordance with the invention to use an adhesive which, when heated, at least partially loses its adhesive capacity. Thereby, the hose is simply retained in its expanded state, but can easily be released by heating when the sleeve assembly is to be used.

Ved en foretrukken fremgangsmåde ifølge opfindelsen anvendes der en slange, som består af et eller flere lag, af hvilke mindst ét lag kan bestå af halvledende materiale.In a preferred method according to the invention, a hose is composed of one or more layers, of which at least one layer may consist of semiconducting material.

En sådan fremgangsmåde muliggør, at muffeenheden kan an-15 vendes til kabler med meget høj spænding, hvor selve kab let er forsynet med halvledende skærme, og hvor det derfor er nødvendigt ved en kabelafslutning eller en kabelforbindelse at sørge for, at det elektrostatiske potentialforløb bliver udjævnet for undgåelse af risiko for 20 gennemslag.Such a method enables the socket unit to be used for very high voltage cables where the cable itself is easily provided with semiconductor screens and where it is therefore necessary to ensure that the electrostatic potential loss is at a cable termination or cable connection. leveled to avoid the risk of 20 breakthroughs.

Opfindelsen angår tillige en fremgangsmåde ved anvendelse af en muffeenhed, der er fremstillet på den ovenfor angivne måde, og ved hvilken slangen fastholdes i ekspanderet tilstand ved hjælp af et undertryk i rummet mel-25 lem slangen og muffekroppen. En sådan fremgangsmåde er ifølge opfindelsen ejendommelig ved, at muffeenheden indskydes over den eller de i det mindste delvis afbarkede kabelender, hvorpå rummet mellem slangen og muffe-kroppen forbindes med den omgivende luft eller til et 30 reservoir for et hærdende, eventuelt ekspanderbart iso lerende materiale. Det er indlysende, at en sådan anbringelse af muffeenheden er overordentlig hurtig og 3 150089 nem at foretage, og man kan da efter ønske få rummet mellem slangen og selve muffekroppen, fyldt med luft eller med et isolationsmateriale, som let kan indsuges alene ved det undertryk, der opstår, når slangen krym-5 per.The invention also relates to a method of using a sleeve assembly made in the above manner and in which the hose is held in expanded condition by means of a vacuum in the space between the hose and the sleeve body. According to the invention, such a method is characterized in that the socket unit is inserted over the at least partially barked cable ends, whereby the space between the hose and the socket body is connected to the ambient air or to a reservoir for a hardening, possibly expandable insulating material. . It is obvious that such an arrangement of the sleeve assembly is extremely quick and easy to make, and then the space between the hose and the sleeve body, filled with air or with an insulating material, which can easily be sucked in by the negative pressure can be obtained that occurs when the tubing shrinks-5 per.

Ved anvendelse af en muffeenhed, ved hvilken slangen efter ekspansion er klæbet til indersiden af muffekroppen, er det ifølge opfindelsen hensigtsmæssigt at anvende en sådan på den måde, at muffeenheden indskydes 10 over den eller de i det mindste delvis afbarkede kabelender, hvorpå enheden opvarmes til frigørelse af slangens klæbning mod muffekroppens inderside.According to the invention, it is appropriate to use such a sleeve unit in which the hose is adhered to the inside of the sleeve body after expansion in such a way that the sleeve unit is inserted 10 over the at least partially barked cable ends on which the unit is heated to releasing the hose adhesive to the inside of the sleeve body.

Når en sådan muffeenhed er anbragt på kabelenderne, og slangen er frigjort således, at den er krympet sammen 15 omkring kabelenderne, kan man endvidere ifølge opfin delsen tilvejebringe en ekstra støtte og isolation ved at et isolerende, eventuelt ekspanderbart materiale indføres i det nævnte mellemrum til udfyldning af dette.Furthermore, when such a sleeve assembly is disposed on the cable ends and the hose is released such that it is shrunk together around the cable ends, an additional support and insulation can be provided according to the invention by introducing an insulating, possibly expandable material, into the space provided. filling in this.

Z0 Opfindelsen skal i det følgende beskrives nærmere i forbindelse med tegningen, hvor fig. 1 viser, et første trin under fremstillingen af en muffeenhed, fig. 2 viser en muffeenhed færdigfremstillet i overens-25 stemmelse med opfindelsen og anbragt over en kabelende, fig. 3 viser den samme muffeenhed anbragt over to sammenføjede kabelender, og 4 150089 fig. 4 viser en særlig udførelsesform for en muffeenhed færdigmonteret på en kabelende.The invention will now be described in more detail in connection with the drawing, in which fig. 1 shows a first step in the manufacture of a sleeve assembly; FIG. Figure 2 shows a sleeve assembly completed in accordance with the invention and disposed over a cable end; 3 shows the same sleeve assembly disposed over two joined cable ends, and FIG. 4 shows a particular embodiment of a sleeve assembly pre-assembled on a cable end.

I fig. 1 ses en muffeenhed, som består af en rørformet muffekrop 1, inden i hvilken der er anbragt en slange 2 5 af elastisk deformerbart materiale. Slangens diameter er væsentligt mindre end den indre diameter af muffekroppen 1, og ved enderne er slangen ekspanderet til dannelse af udvidelser 3, der er fastgjort til den indre overflade af muffekroppen 1 enten ved svejsning eller 10 klæbning. Muffekroppen er endvidere forsynet med en åbning 4.In FIG. 1 shows a sleeve assembly consisting of a tubular sleeve body 1 within which is arranged a hose 25 of elastically deformable material. The diameter of the hose is substantially smaller than the inner diameter of the sleeve body 1, and at the ends the hose is expanded to form extensions 3 which are attached to the inner surface of the sleeve body 1 either by welding or bonding. The sleeve body is further provided with an opening 4.

I fig. 2 er vist den færdige muffeenhed, hvor slangen 2 er ekspanderet til anlæg mod den indre overflade af muffekroppen 1. Denne ekspansion kan hensigtsmæssigt 15 være foretaget ved udsugning af luften i mellemrummetIn FIG. 2 is shown the finished socket unit, in which the hose 2 is expanded to abut the inner surface of the socket body 1. This expansion may conveniently be made by suctioning the air in the space

mellem slangen 2 og muffekroppen 1, hvilken udsugning kan finde sted gennem åbningen 4. Slangen 2 kan være fastholdt i den ekspanderede stilling enten ved klæbning eller ved det undertryk, der er skabt, idet man 20 da som vist har forsynet åbningen 4 med en prop 5. Ibetween the hose 2 and the sleeve body 1, which suction can take place through the opening 4. The hose 2 can be retained in the expanded position either by adhesion or by the negative pressure created, since then the opening 4 is provided with a plug as shown. 5. I

fig. 2 ses endvidere anbringelsen af en kabelende 6, der er delvis afbarket og indstukket i muffeenheden, hvis indre dimensioner efter ekspanderingen af slangen giver god plads for indføring af kabelenden. Kabelen-25 den er forbundet med en tilslutningsledning 7 på vilkårlig kendt måde, således at hele forbindelsesstedet ligger inden for muffeenheden.FIG. 2, there is also seen the placement of a cable end 6, which is partially debarked and inserted into the socket unit, whose internal dimensions after expansion of the hose provide good space for insertion of the cable end. The cable 25 is connected to a connection line 7 in any known manner so that the entire connection point is within the socket unit.

Den endelige omslutning af kabelenden og kabelforbindelsen kan, som ovenfor omtalt, foretages ved, at den 30 ekspanderede slange 2 frigøres ved udløsning af klæb ningen eller undertrykket og derved fastkrympes omkring kabelforbindelsen.The final wrapping of the cable end and cable connection can, as mentioned above, be effected by releasing the expanded hose 2 by release of the adhesive or suppressed, thereby shrinking around the cable connection.

Claims

150089 1 fig. 3, a corresponding sleeve assembly is shown over two joined cable ends 6 and 6a, also before the hose 2 shrinks around the cable ends, and the sleeve body may then be made of a non-shrinkable material, e.g. 5 metal. In FIG. 4, there is shown a particular embodiment of a sleeve assembly with a sleeve body 11 provided with transverse flanges for supporting the assembly. The sleeve body is similar to that of FIG. 1 and 2 have an opening 4 and a hose 2, which is partly expanded at the ends to form extensions 3, which are attached to the sleeve body 11 and partly expanded in the same manner as shown. in FIG. 2, after which the plug 5 has been removed, whereby the hose has shrunk 15 around the cable end 6 and the connection to the terminal conduit 7. Thus, the space between the hose 2 and the sleeve body 11 can be air-filled, but insulating can also be placed in this space. material, for example in the form of expandable plastic, which can either be introduced immediately in connection with shrinkage of the hose or can be introduced afterwards. In most cases, to prevent pollution, the hole 4 will be closed.

A method of manufacturing a sleeve assembly serving for assembly 25 or termination of high current cables, consisting of a tubular sleeve body, in the interior of which a resilient hose, whose ends are expanded. and is permanently attached to the sleeve body, characterized in that the portion of the hose located between the hose ends 30 is caused to expand and be retained in its expanded state either by means of the vacuum or by adhering to the sleeve body by means of negative pressure in the space between the hose and the body. inside.